Postgraphile jwt RLS

This is a simple expressjs demo project created based on Row Level Security in Postgraphile Mixing with RLS and RBAC from PostgreSQL.

Requirements

• Node 10.15+
• PostgreSQL 9.6+

Setup

Create a database named jwt-graphile-example in your local environment.

We are using the default user generated by postgres: postgres when creating a database to run this example.

If you want to use a specific role and a specific database, please think to:

• update database name that is used in your config file.
• update role name and password that are used to connect to the database in your config file.
• update role name in the structure file.

Note: You can always overwrite your config via environmental variables. More in good-config documentation.

Installation

npm install
npm run db

Running

npm start

Structure

You can check db.sql file to know the sql structure.

Testing authentication

Required data - JWT

First, visit http://localhost:3131/login to get back JWT's associated to the users:

// {userId: "JWT"}

{
"1": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJyb2xlIjoidXNlcl9sb2dpbiIsInVzZXJfaWQiOjEsImlhdCI6MTU1MDUwMDgwMH0.wqSPESwLzs671yVKyBD0WK_Ppm8oXJOi06UeA7sn7Oc",
"2": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJyb2xlIjoidXNlcl9sb2dpbiIsInVzZXJfaWQiOjIsImlhdCI6MTU1MDUwMDgwMH0.gGP7YH84vdsLYiwiF7QK3FV63-qs0A63VvPgEfwoDjo",
"admin": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJyb2xlIjoidXNlcl9hZG1pbiIsInVzZXJfaWQiOjAsImlhdCI6MTU1MDUwMDgwMH0.0G1aHgGJcTwCoWCDHBY6pFhZUlb_ML-1t11DZqNTuCM"
}

JWT payload contains id and role of the associated user.

Basic user information request

With the JWT associated to user 1, we can test if user with id 1 can see all data it is supposed to:

curl --request POST \
  --url http://localhost:3131/graphql \
  --header 'authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJyb2xlIjoidXNlcl9sb2dpbiIsInVzZXJfaWQiOjEsImlhdCI6MTU1MDUwMDgwMH0.wqSPESwLzs671yVKyBD0WK_Ppm8oXJOi06UeA7sn7Oc' \
  --header 'content-type: application/json' \
  --data '{"query":"{\n  allUsers {\n    nodes {\n      id\n      name\n      familyName\n    }\n  }\n}"}'

We are requesting all users but we would get only user 1 information as a result:

 {
  "data": {
    "allUsers": {
      "nodes": [
        {
          "id": 1,
          "name": "Majid",
          "familyName": "Garmaroudi"
        }
      ]
    }
  }
}

Repeat the same with the token associated to user 2, you will get only data related to user 2.

Repeat the same with the token associated to the admin admin, you should see as a result:

 {
  "data": {
    "allUsers": {
      "nodes": [
        {
          "id": 1,
          "name": "Majid",
          "familyName": "Garmaroudi"
        },
        {
          "id": 2,
          "name": "Paul",
          "familyName": "Rolland"
        }
      ]
    }
  }
}

So far, we tested 2 different roles for a same query with 3 different results.

Moreover, we allowed anonymous users to have access to register_user function:

curl --request POST \
  --url http://localhost:3131/graphql \
  --header 'content-type: application/json' \
  --data '{"query":"mutation {\n  register(input: {\n    firstName: \"johan\"\n    lastName: \"zoidberg\"\n    email: \"johan@zoidberg.com\"\n    password: \"futurama\"\n  }) {\n    user {\n      id\n      name\n    }\n  }\n}"}'

Advanced user information request

More complex queries can be done in meme table where we want users have access to everyones meme but can only update their own.

curl --request POST \
  --url http://localhost:3131/graphql \
  --header 'authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJyb2xlIjoidXNlcl9sb2dpbiIsInVzZXJfaWQiOjEsImlhdCI6MTU1MDUwNDA3NH0._aM0Z_9F0LXG10yHLThsKtMD0QRPD_VOOH2bbkJep3g' \
  --header 'content-type: application/json' \
  --data '{"query":"{\n  allUserMemes {\n    nodes {\n      id\n      userId\n      memeUrl\n    }\n  }\n}"}'

This will return all memes no matter what JWT we use.

{
  "data": {
    "allUserMemes": {
      "nodes": [
        {
          "id": 1,
          "userId": 1,
          "memeUrl": "http://meme1"
        },
        {
          "id": 2,
          "userId": 1,
          "memeUrl": "http://meme2"
        },
        {
          "id": 3,
          "userId": 1,
          "memeUrl": "http://meme4"
        },
        {
          "id": 4,
          "userId": 2,
          "memeUrl": "http://meme5"
        },
        {
          "id": 5,
          "userId": 2,
          "memeUrl": "http://meme6"
        }
      ]
    }
  }
}

But if we try to update meme number 1 with user id 2 JWT, it would fail:

curl --request POST \
  --url http://localhost:3131/graphql \
  --header 'authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJyb2xlIjoidXNlcl9sb2dpbiIsInVzZXJfaWQiOjEsImlhdCI6MTU1MDUwNDA3NH0._aM0Z_9F0LXG10yHLThsKtMD0QRPD_VOOH2bbkJep3g' \
  --header 'content-type: application/json' \
  --data '{"query":"mutation {\n  updateUserMemeById(input:{id: 2,userMemePatch: {memeUrl:\"http://newmeme1\"}}) {\n    userMeme {\n      id\n      userId\n      memeUrl\n    }\n  }\n}"}'

You will get an error that there is nothing to update:

{
  "errors": [
    {
      "extensions": {
        "exception": {}
      },
      "message": "No values were updated in collection 'user_memes' because no values were found.",
      "locations": [
        {
          "line": 2,
          "column": 3
        }
      ],
      "path": [
        "updateUserMemeById"
      ],
      "stack": "Error: No values were updated in collection 'user_memes' because no values were found.\n    at commonCodeRenameMe (/private/var/www/vntrs/graphileauth/node_modules/graphile-build-pg/node8plus/plugins/PgMutationUpdateDeletePlugin.js:122:17)\n    at process._tickCallback (internal/process/next_tick.js:68:7)"
    }
  ],
  "data": {
    "updateUserMemeById": null
  }
}

Contributors

• Paul Rolland

Note

Thanks Benjie Gillam for the guides, clarifications and patiently answering all our questions.